My SKS uses 30 round detachable magazines, so OP is not incorrect. it's a rifle that's been around forever with tons of different configurations

This is definitely my answer as well. Really wish I could wipe my memory and experience it again, I've never played a game quite like it. That first bombshell they drop after 20 mins in (IFYKYK) absolutely blew me away

You can put your boots in the oven, but that don't make 'em biscuits